21
Applicable extension pipe for each model
The height difference between indoor and outdoor unit should be kept within 30 m for all models.
(1) 1:1 system
(a) Maximum pipe length
(b) Adjusting the amount of refrigerant
• Additional refrigerant charge is not necessary for the pipe length up to 30 m. When the pipe length exceeds 30 m or service
(refrigerant replacement) is performed, charge proper amount of refrigerant for each pipe length referring to table below.
Use refrigerant R410A. Use charge hose exclusive for R410A.
• When charging additional refrigerant, charge the refrigerant from low-pressure side of the port valve using a safety charger.
• Make sure that air purge for this unit at refrigerant replacement is performed from both high-pressure check valve and ser-
vice port. If air purge is performed only from one of them, air in not purged enough.
• When replacing refrigerant, charge the refrigerant from service port. When charged refrigerant is less than specified amount,
charge the refrigerant again from low pressure side of the port valve using a safety charger.
• Tighten the service port cap (nut) of stop valve firmly. The tightening torque is 12 to 16 N·m. (to prevent slow-leak)
• Check additional refrigerant charging amount referring to table 4 when liquid pipe is one size larger than standard diameter,
and table 2 when the pipe is standard diameter.
15
30m or
above
31 — 40m
0.2kg
0.6Kg
0.6kg
10m or below
41 — 50m
0.4kg
1.2Kg
1.2kg
51 — 60m
—
—
1.8kg
61 — 75m
—
—
2.4kg
<Table 2> Additional refrigerant charging amount for pipe of standard diameter
<Table 3>
Outdoor unit
Permitted
pipe length
Additional refrigerant charging amount for pipe
length exceeding 30 m (kg)
PUHZ-RP1.6, 2VHA
PUHZ-RP2.5, 3VHA, 2.5, 3VHA
1
PUHZ-RP4-6VHA, RP4-6VHA
1
Outdoor unit
Number of
bends
Height
difference
50m or less
50m or less
75m or less
Permitted
pipe length
50m or less
50m or less
75m or less
75m or less
2.1
3.1
5.1
4.6
11 — 20m 21 — 30m
2.3
3.3
5.3
4.8
2.5
3.5
5.5
5.0
31 — 40m
2.7
(0.2)
4.1
(0.6)
6.1
(0.6)
5.6
(0.6)
2.9
(0.4)
4.7
(1.2)
6.7
(1.2)
6.2
(1.2)
—
—
—
—
7.3
(1.8)
6.8
(1.8)
—
—
—
—
7.9
(2.4)
7.4
(2.4)
41 — 50m 51 — 60m 61 — 75m
Recharge refrigerant amount or additional amount in parentheses
PUHZ-RP1.6, 2VHA
PUHZ-RP2.5, 3VHA
PUHZ-RP2.5, 3VHA
1
PUHZ-RP4-6VHA
PUHZ-RP4-6VHA
1
Liquid
pipe
(mm)
Gas
pipe
(mm)
[
6.35
[
9.52
[
12.7
[
9.52
OD
Thick-
ness
OD
Thick-
ness
RP1.6
RP2
RP2.5
RP3
RP4
RP5
RP6
t0.8
[
12.7
t0.8
[
15.88
t1.0
[
12.7
t0.8
[
15.88
t1.0
[
19.05
t1.0
[
15.88
t1.0
[
19.05
t1.0
t0.8
t0.8
: Standard piping
: It can be used, however, additional refrigerant charge is required when the pipe length exceeds 20m. Refer to <table 4>.
: It cannot be used.
: It can be used.
: It can be used, however, the capacity is lowered. Refer to (c) Capacity correction.
<Table 1> Pipe length for 1:1 system
*1: Set DIP SW8-1 on outdoor unit controller board to ON.
*2: The maximum length is 50 m in case of using existing pipes.
[Marks in the table above]
50m
t0.8
30m
30m
10m
30m
30m
50m
30m
50m
50m
10m
50m (
*1
)
75m (
*2
)
50m
10m
30m
30m
10m
50m
75m (
*2
)
75m (
*2
)
50m (
*1
)
30m (
*1
)
50m (
*1
)
50m (
*1
)
50m (
*1
)
50m (
*1
)
50m
10m
30m
30m
30m (
*1
)
<Table 4> Required additional charge when the pipe size is larger than the standard diameter
[
9.52
[
12.7
[
12.7
RP1.6, 2
RP2.5, 3
RP4-6
Liquid pipe dia Chargeless
30m
30m
50m
60 g per 1 m longer than 20 m
100 g per 1 m longer than 20 m
100 g per 1 m longer than 20 m
20m
20m
20m
Max. pipe length
Refrigerant amount to be added
OC294-C-1.qxp 04.10.7 5:11 PM Page 21
